Grinding-mill.



GmNmNG Mm.

APPLICATION flLED DEC. I6 9|3. 1,241,749. Patented Oct. 2,1917.

.3 SHEETS- SHEET l. 67 60 63, 6:2 5% Il X75 E. F. McCOOL.

GRINDING MlLL.

Patented Oct. 2,1917.

3 SHEETS-SHEET 3.

will enable others skilled in the art to which.

- UNITED STATES, PATENT OFFICE.

EDWARD F. MOCOOL, or VICTOR, CoLORADdAssIGNon To THE nfocooL MFG. TRADING Co., OF VICTOR, COLORADO, A CORPORATION OF COLORADO.

GRINDING-MILI..

Specification of Letters Patent.

Patented Oct. 2, 1917.

Application filed December 16, 1913. Serial No. 806,952.

ToaZZ whom t may concern.'

Be it known that I, EDWARD F. MoCooL, a citizen of the United States, residing at Victor, county of Teller, and State of Colorado, have invented certain new and useful Improvements in Grinding-Mills; and I do declare the following to be a full,.clear, and exact description of the invention, such as it appertains to make and use the same, reference being had to the accompanying drawings, andy to the characters of reference 'marked thereon, which form a part of this specification'.

My lnvention relates to improvements 1n grinding mills, adapted for use in pulver- 12mg` ore, rock, coal, or other material,

which it may be necessary to reduce to a finely comniinuted condition. The construction is particularly well adapted for finely pulverizing coal, where it is desired to use the latter in pulverulent form. .A My. improved grinder` is of the form in which two disks arranged in coperative relation are employed, one being stationary, and the other movable rotatably and also bodily in an orbit, and to this end, the rotary disk is Iconnected to rotate with a shaft` which is passed eccentrically through another shaft, thetwo shafts rotating at different speed's. By virtue of this arrangement, the rotary shaft turns upon its own axis and also travels in an Orbit due to the travel of its shaft with the hollow shaft.

A novel feature of my present construction, consists in employing balls in connection with the disks for grinding purposes. As illustrated in the drawing, the two cooperating disks are recessed to form races in which the grinding balls are located, tliese ball races being made relatively large in order to permit the lateral or gyratory action of the rotary disk due to the eccentric mounting of its shaft in the hollow cooperating shaft.

My improved mill as disclosed in this application, is vertically arranged or so constructed that the operating shafts are vertically disposed, while the grinding disks are horizontally arranged, Vthe stationary disk being uppermost and centrally perforated to allow the material to be ground to pass into the grinding position between the two disks from a hopper arranged at the top of the mill, and whose bottom opening registers with the central opening in the stationary disk.

' Furthermore, the shaft which is connected with the rotary disk is movable endwise to allow the disks toopen, to permit the escape of a relatively hard^foreignsubstance which may be accidentally delivered to the disks withA the material lunder treatment. It sometimes happens that a tool, as a wrench or other metal device, gets into the material to be ground and is accidentally fed into the grinding position, between the disks. In this event, in the absence of provision for allowing the disks to automatically open to permit the hard substance to escape, the mechanism would be seriously injured.

Having briefly outlined my improved construction, I `will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing Figure 1 is a vertical section taken approximately centrally through my improved mill.

Fig. 2 is a horizontal section taken on the line 2 2, Fig. 1.

Fig. 3 is an end view in detail of the star-wheel extremity of the eccentrica-Hy mounted shaft.

Fig. 4 is a sectional view in detail, taken on the line 4 4, Fig. 1, illustrating the spring for controlling the endwise movement of the eccentrically mounted shaft, through the medium of suitable connections.

Fig. 5 is a cross section taken on the line 5 5, Fig. 1, looking downwardly.

Fig. 6 is a section taken throu h the lower extremity of the eccentrical y mounted shaft. In this View, parts above the plane ofy the section line are illustrated to show the manner of applying rotary power to the eccentrically mounted shaft, the parts bel ling' shown on a larger scale.

l suitable form of"v fastening device.

protecting the operating gears as hereinafter fully described in detail. To the upperextremity of the. main frame 5, is secured a housing 6 by means of fastening devices 7 consisting of bolts, cap screws, orany other this housing, is located a rotary fan 8 whose hub 9 is splined as shown at 10 upon a sleeve l2 which is journaled in a stationary sleeve 13 mounted in the upper part of the framework, and whose upper extremity forms a shoulder 14 against which the hub of the fan blower abuts. The loweryextremity of the sleeve 12 has a splined connection 15, with a gear 16 which meshes with a larger gear 17 fast on a shaft 18 to which is also made fast a beveled gear 19 meshing with a similar gear 20 fast on an operating shaft 21 upon which are mounted fast and loose pulleys 22 in the usual manner for operating purposes. disposed and journaled as shown at 23 and 24 in the lower part of the framework 5 of the structure.

By virtue relatively large as compared with the gear 16 which is fast upon the sleeve for imparting rotary movement to the fan, it is evident that the action of the latter willfvbe rela?- tively rapid.

The blades disposed between top and bottom plates 26 and 27 and surround the grinding disks or jaws 28 and 29. The disk 28 is stationary and secured to flanges 30 of the hopper 31 by means .of bolts 32 which are passed through registering openings formed in a flange 33 of the disk and the abutting flange 30 of the hopper.

The disk 29 has an interlocking connection by means of depending-lugs 34 with a -head 35 which is splined as shown at 36 on the I upper extremity of -a shaft 37, which is eccentrically mounted in a hollow shaft 38 to which rotary movement is imparted through the medium of a gear 39, fast on the hollow shaft 38 and a gear 40 fast on the shaft 18, the last named gear being relatively small as compared with the gear 39, whereby a )relatively slow movement 1s imparted to the hollow shaft.

To the lower portion of thel shaft 37 is splined asshown at 41 a star-wheel 42, the arms 43 of which lie in the path of depending projections 44 formed on a gear 45 which meshes with a gear 48 fast on the shaft 18. As this ear 48 is larger than the gear 45, itis evident that a relatively rapid movement will be imparted to the shaft 37 as compared with the movement of the hollow shaft 38 in which the shaft 37 is eccentrically mounted.

lin order to regulate the mesh or iineness to which the material is ground, the rear ex- Within The shaft 21 is horizontally of the fact that 'the gear 17 isV 25 of this fan are 'vertically' mamas work `and extends upwardly beyond/the same, lts upper extension passing through an opening 51 formed in a cross head'52. The rod extends is threaded as shown at 53 to receive a nut 54 which is relatively large to facilitate hand adjustment." Between the frame ,and the cross headfa spiral spring 55 surrounds the rod and its tension is regulated by the nut 54, whose action on the. cross head increases pending upon the direction in which the nut is turned. side of they rod by means of bolts 56 which are threaded into the frame and pass frthrough openingls 57 formed in the opposit `extremities of t e cross head.

By virtue of this arrangement, understood that the` shaft 37 isy endwise adjustable and also/yieldingly retainedin the adjusted position, whereby the'rotary jaw above the cross head, and

so and reduces the tension of ,the spring, de-

The cross head is guided on each itwiu te 29 is allowed to move "downwardly away from its coperating stationary ever circumstances may require, as when a lpiece of iron or other hardy substance which the jaws are not supposed to act upon, is-

with the material accidentally fed thereto under treatment.

vj aw when- The adjacent faces of the l'two jawfs/ 28 and'4 movement or lateral travel ofthe rotary jaw with the shaft 37 by virtue of its eccentric mounting whereby the j the axis of the shaft 37, but also travels bodily withthe said shaft in an orbit, whose diameter` is determined by the distancebetween the axis of the shaft 37 and that of the hollow shaft 38.

The areas of the faces of the grinding disks 28 and 29 which are surrounded by the innermost set of balls 58, are roughened or provided with radially arranged teeth respectively designated,` 60 and 61. As illustrated inthe drawing, the grinding face of the rotary disk generally considered is convex in form, w ile the corresponding or cooperating face of the stationary disk is con. cave.,1 The outer portions of the coperating faces of these disks gradually approach each other, while these faces diverge toward the center of the rotary' disk. In my present form of construction, the central part of the stationary disk is absent, or cut out to form the feed opening 62 which registers with the opening in the bottom of the hopper to which the material 63 on the hollow coperating shaft,

aw 29 not only rotates upon to be treated is fed.

i body of such housing, by means of suitable fastening `devices as bolts 64. This to plate is provided with an upwardly exten ing part 66 having an interiorly rojecting flange 67 at the top, which is ov rapped by a corresponding part 68 of the hopper, the abutting parts being connected by bolts 69 or other suitable fastening devices. The structure is provided with openings 70 and 71 to permit the free ingress of the air from the top of-the fan chamber in order that the air may respond to the suction or vacuum producing tendency due to the rotary action of the fan.

From the foregoing description, the use and operation 4of my improved construction will be readily understood. As has already been stated, it is assumed that the apparatus occupies an u right position so that the op- `erating sha s are vertically disposed.

Power, taken from' any suitable source is transmitted to the operating shaft 21, and thence to the counter shaft 18 from which it is imparted "to the fan 8 and the rotary grinding disk 29 as heretofore described n detail. The movement/ of the fan is relatively rapid, while the rotary action of the disk 29 on. its own axis is comparatively slow. This shaft 37 'moves at a different speed from the sleeve 38 with which Vthe shaft 37 travels bodily, as heretofore explained. It is evident that the relative rotary movements of the various parts of the structure may be regulated at will or as circumstances may require or dictate, since this is only a matter of the relative size or arrangement ofthe coperating gear wheels.

The material 63 to be treated is fed into the hopper. 31, and delivered to the center Y of the grinding face of the rotary disk 29 through coperating openings formed in the bottom of the hopper andthe center of the stationary disk.. .As the disk 29 rotates on its own axis, and also moves by virtue of the eccentric mounting of the shaft 37 in the hollow shaft or sleeve 38, the grinding operation is effected. The material gradually works outwardlyunder the grinding action of thev disks. As soon as it reaches the grinding balls 58 and 59, these serve to still further reduce or comminute the particles,the mesh or fneness being determined by the space 72 between the outer edges of the grinding disks beyond the pulverizing balls 59. As soon as the pulverized material leaves thevdisks, it is acted upon by the air current generated by the -action of the fan, and carried out of the housing 6 through an opening 73, (see Fig. 2.) This pulverized material may be delivered to any suitable receptacle or to a coal-burning furnace ,in the event that the-grinderis used y.the framework.

for the production of fuel purposes. y

Attention is called to the fact that the lever 86 does not directly engage the lower pulverulent coal for X extremity of the shaft 37 but actsupon a thrust block 75 whose upper extremity 77 forms a support for the lower end of the shaft37.- The thrust block 75 is vertically movable in a chamber 103 formed in a easing l02which is securedv to the base of the frame by bolts 89. The thrust block is bifurcated as shown at 76 to straddle the lever 86. The casing 102 is recessed as shown at 74 to receive the lever 86. v

The counter-shaft 18 is supported upon the stationary framework 5 by means of an arm 90 formed integral with the frame and projecting interiorly into the chamber of The inner extremity of this arm is perforated as shownat 91 to receive the lower reduced end 92 of the shaft 18 which terminates just above the operating shaft 21.

In order to control the inlet of air to the fan chamber through the openings 70, a band 93 is applied to the structure surrounding the hopper, the said band having perforations 94 adapted to register with the openings 70. This band is adjustable to regulate the entrance of air through the openings 7 O, or to entirely cut off the same, as may be desired. f

In order to break the vacuum within the fan chamber when the perforations are closed by the proper adjustment of the band 93, as aforesaid, the lower part of the fan casing is provided with openings 95 to permit the entrance of air from the casing to the fan, whereby a circulation is permitted.

In order to separate a relatively coarse grade of material from the properly pulverized particles I equip the fan casing near its exit opening with a sort of valve' or separating device 96, which is pivoted at 97 and provided with a projection 98 which enters a curved slot 99 formed in the casing. This device is located near the outer wall at the exit extremity of the casing and separates the relatively large particles which are cai'- ried farthest outwardly under the influence of the centrifugal force imparted thereto by the rotating fan. Hence, these coarse portions of the product will escape through the passage 100 between the separating device and the Wall of the casing, and will pass thence into a channel 101 formed in a bracket 104 and secured to the exit portion of the casing by bolts 105. This coarse material, after being separated from the finer product in the aforesaid manner, may be returned by any suitable means to the mill for re-grinding- Having thus described my invention, what I claim is:

.1. The combination of two 4cotiperatng 130 disks having interposed grinding balls, and means for imparting a rotary movement to one rldisk on its own axis, means for simultaneously imparting an orbital travel to the last named disk, and means for feeding material to be treated to the disks for grindv ing purposes.

2. rlhe combinationof two cooperating disks, having interposed balls located in a race formed in the adjacent faces of the disks, the race being enlargedto permit lateral movement of the balls therein, and means for simultaneously imparting both rotary and orbital travel to one of the disks.

The combination of two coperating grinding members, having outer and inner areas, infone of which is formed a race in which balls-are located, the race being larger than the ballsto facilitate lateral movement of one member with respectf to the other.

4. The combination. in a grinding mill of grinding members, a chamber in which the members are located, a fan surrounding the grinding members for expelling the pulverized product, the said chamber being promme@ vided with a separating device located near the outer wall of its exit opening, forming an outer passage forthe escape from the chamber of a relatively coarse grade of material which is carried outwardly by centrifugal force'.

5. A grinding mill comprising grinding elements, a chamber in which the said elements are located, the chamber being provided with an exit for the pulverized product, a fan located within the said chamber in `the vicinity of fsaid elements for expelling the pulverized product, the fan chamber being provided with an adjustable device lo- 1 `cated near`the outer wall and adjacentits exit opening for separating the coarser product fromthe liner material, and expelling it separately from the chamber.

In testlmony whereof I alflx my signature in presence of two witnesses.

EDWARD F. MCCOOL.

Witnesses: i

A. J. OBRIEN, IA. EBERT OBnmn. 

